It's no secret that most people in physics are men. Is this due to an inherent different in the abilities of men and women to learn physics, or rather that women simply have not been encouraged enough to do physics. By the first case, I mean that are the differences ingrained from birth, and that men are simply superior when it comes to physics? Has it been shown that in general, men have better analytical ability than women? Is this why some women who are not that good are still able to get into good graduate school? Is this fair that they only have to compete against other women, when some men who are much better are not accepted? Although some women do pretty well, it is very rare to find a woman who is brilliant in physics. I do not think this is the environmental factor, and attribute it to an inherent difference in abilities. Even if you encourage a women from birth to do physics, and she is motivated, the best she could ever do would never compare to the best a man could do. I understand that a woman can perform much better than men in physics, but why is it that on average you rarely see women in graduate school? Perhaps it is not suitable for them only because they cannot handle the work. On average, their undergraduate preparation is worse than men's, they score lower on the physics gre. Of course, this is not true in every case, but it is definitely true in most cases. Similarly, why are most great physics foreign scientists? I believe they have an inherent better analytical ability than non foreign scientists.